Magnetic recording medium

Abstract

A magnetic recording medium comprises a nonmagnetic support and a magnetic recording layer provided on the support which comprises two layers including a first magnetic recording layer and a second magnetic recording layer. Each of the two magnetic recording layers contains a ferromagnetic powder having a coercive force of not less than 500 Oe dispersed therein. The first magnetic recording layer is provided on the support has a Young's modulus of 500 to 1,000 kg/mm 2 ; and the second magnetic recording layer provided on the first magnetic recording layer has a Young's modulus of not less than 1,300 kg/mm 2 ; and the magnetic recording layers as a whole show a Young's modulus of not less than 900 kg/mm 2 .

We claim: 
     
       1. A magnetic recording tape comprising a nonmagnetic support and a magnetic recording layer provided on the support which comprises two layers including a first magnetic recording layer and a second magnetic recording layer, each of said first and second magnetic recording layers comprising a binder and a ferromagnetic powder having a coercive force of not less than 500 Oe dispersed therein, wherein: said first magnetic recording layer provided on the nonmagnetic support has a Young's modulus in the longitudinal direction of 500 to 1,000 kg/mm 2  ;   said second magnetic recording layer provided on the first magnetic recording layer has a Young's modulus in the longitudinal direction of not less than 1,300 kg/mm 2  ; and   the magnetic recording layers as a whole show a Young's modulus in the longitudinal direction of not less than 900 kg/mm 2 .   
     
     
       2. The magnetic recording tape as claimed in claim 1, wherein said each of the binders of the first and second magnetic recording layers contains a vinyl chloride copolymer and a polyurethane resin. 
     
     
       3. The magnetic recording tape as claimed in claim 1, wherein the total thickness of the first magnetic recording layer and the second magnetic recording layer is in the range of 2 to 10 μm. 
     
     
       4. The magnetic recording tape as claimed in claim 1, wherein the thickness of the second magnetic recording layer is not larger than 2 μm, and the thickness of the first magnetic recording layer is larger than that of the second magnetic recording layer. 
     
     
       5. The magnetic recording tape as claimed in claim 1, wherein the binder of the first magnetic recording layer contains a polyurethane resin in an amount of not less than 60 wt.%. 
     
     
       6. The magnetic recording tape as claimed in claim 1, wherein the binder of the first magnetic recording layer contains a vinyl chloride copolymer and a polyurethane resin, the amount of the polyurethane being not less than 60 wt.% of the total binder. 
     
     
       7. The magnetic recording tape as claimed in claim 1, wherein the ferromagnetic powder of the first and second magnetic recording layers are Co-containing γ-magnetic powder.